frontend/src/index.js

import React from 'react';
import ReactDOM from 'react-dom/client';
import { BrowserRouter } from 'react-router-dom';
import { QueryClient, QueryClientProvider } from 'react-query';
import { Toaster } from 'react-hot-toast';
import App from './App';
import './styles/globals.css';

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      retry: 1,
      refetchOnWindowFocus: false,
    },
  },
});

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>

    <QueryClientProvider client={queryClient}>

      <BrowserRouter>

        <App />

        <Toaster 

          position="top-right"

          toastOptions={{

            style: {

              background: '#1a1a1a',

              color: '#ffffff',

              border: '1px solid #333',

            },

          }}

        />

      </BrowserRouter>

    </QueryClientProvider>

  </React.StrictMode>
);